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Desulfuration method by directly utilizing magnesium slags in circulating fluidized bed boiler

A circulating fluidized bed, magnesium slag technology, applied in chemical instruments and methods, separation methods, process efficiency improvement and other directions, can solve the problems of high atomization system requirements, clogging, removal efficiency and low utilization rate of desulfurizers

Active Publication Date: 2010-05-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process system is complex and the investment is high; waste water will be generated during the treatment process, which needs further treatment; the wear and tear of the circulating pump affects the reliability of the system, and the energy consumption is also high
For the semi-dry process, including the spray drying process and the circulating fluidized bed process, because the lime slurry is sprayed into the reactor, the system must also be equipped with quicklime digestion and pulping equipment, which requires high atomization systems, resulting in equipment costs still higher
During the operation of spray drying and circulating fluidized bed processes, there are common problems of nozzle corrosion, wear, clogging and wall scaling, which affect the reliability of the system
For the dry process, although the system is simple and the investment and operation costs are low, the calcium spraying process in the pulverized coal furnace has low removal efficiency and desulfurization agent utilization; while the circulating fluidized bed boiler uses limestone as the desulfurization agent. Desulfurizer
[0003] Magnesium slag comes from magnesium smelters. For every ton of metal magnesium produced by smelting, about 6-7 tons of magnesium smelting waste slag are produced. The original magnesium slag has no effective disposal method at present and can only be piled up, polluting the soil and the atmospheric environment

Method used

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  • Desulfuration method by directly utilizing magnesium slags in circulating fluidized bed boiler

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] 1. Directly adopt the original magnesium slag as a desulfurizer, and the particle size is crushed to 1mm;

[0026] II. The desulfurization device used mainly includes a circulating fluidized bed boiler furnace 1, a cyclone separator 2, a circulating material control valve 3, a magnesium slag bin 11 and a magnesium slag feeder 12;

[0027] III. The circulating fluidized bed boiler has a capacity of 220t / h. Furnace 1 has a rectangular cross-section with a cross-sectional size of 5160×8680mm. The height of the furnace is 32000mm. Water-cooled walls are arranged around the heating surface. The combustion temperature in the furnace is 930°C; the cyclone separator 2 is To achieve high-temperature gas-solid separation, the separator adopts a water-cooled cyclone separator with a wear-resistant layer. It is designed according to the design specifications of the high-efficiency separator. The inner diameter of the two separators is 4850mm; the circulating material control valve 3...

Embodiment approach 2

[0040] 1. Directly adopt the original magnesium slag as a desulfurizer, and the particle size is crushed to 0.005mm;

[0041] II. The desulfurization device used mainly includes a circulating fluidized bed boiler furnace 1, a cyclone separator 2, a circulating material control valve 3, a magnesium slag bin 11 and a magnesium slag feeder 12;

[0042] III. The circulating fluidized bed boiler has a capacity of 410t / h. Furnace 1 has a rectangular cross-section with a cross-sectional size of 13810×6770mm. The height of the furnace is 34900mm. Water-cooled walls are arranged around the heating surface. The combustion temperature in the furnace is 897°C; cyclone separator 2 is due to To achieve high-temperature gas-solid separation, the separator adopts a water-cooled square cyclone separator with a wear-resistant layer. The cross-section of the two separators is 6910mm×6910mm; the circulating material control valve 3 is used to realize the return of the material, and the J-type valv...

Embodiment approach 3

[0055] The particle size is crushed to 0.5 mm, and the combustion temperature in the furnace is 850° C. Others are the same as Embodiment 1.

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Abstract

The invention provides a desulfuration method by directly utilizing magnesium slags in a circulating fluidized bed boiler, belonging to the technical field of flue gas desulfuration in the circulating fluidized bed boiler, in particular relating to the technical scheme in which magnesium slags are directly used as desulfurating agent for desulfuration in the circulating fluidized bed boiler. The invention directly utilizes magnesium slags and adds the magnesium slags into the hearth of the circulating fluidized bed boiler through a controllable feeding device; the magnesium slags react with the SO2 in the exhaust gas under the condition of good gas-solid contact condition in the circulating fluidized bed; and the temperature condition of 850-950 DEG C in the circulating fluidized bed is beneficial for the gas-solid desulfuration reaction. The invention can realize the desulfuration of the coal burning process by utilizing the characteristics of the magnesium slags and the special burning conditions of the circulating fluidized bed, thus solving the environmental pollution to the air and the soil by the magnesium slags generated in the magnesium smelting process, finding a way for reasonably utilizing waste slags for magnesium enterprises, realizing the purpose of utilizing waste to control waste and achieving the purpose of comprehensive utilization of resources.

Description

technical field [0001] The method for directly using magnesium slag in circulating fluidized bed boilers for desulfurization of the present invention belongs to the technical field of flue gas desulfurization in circulating fluidized bed boilers, and in particular relates to a method for directly using magnesium slag of magnesium smelting waste slag as a desulfurizing agent in a circulating fluidized bed boiler. Technical solution for desulfurization in fluidized bed boilers. Background technique [0002] For SO in coal-fired flue gas 2 Lime / limestone is usually used as a desulfurizer (calcium-based desulfurizer) in the desulfurization technology. The main desulfurization technology is the so-called wet process, which has mature technology, good purification effect and wide application range. However, the process system is complex and the investment is high; waste water is generated during the treatment process and needs to be further treated; the wear and tear of the circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/50C22B7/04
CPCY02P10/20
Inventor 金燕樊保国宋凯乔晓磊
Owner TAIYUAN UNIV OF TECH
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